Power-transmitting mechanism



'May 12, 1925. '1,537,415

K. DAvls POWER TRANSMITTING MECHANISM Filed April 15l 1922 'I 2 Sheets-Sheet 2 Patched' May 1.2, 1925.

l, UNITED. STA

TES ',fPAT-ENT. OFFICE. y

KENNETH imvrs, or s'r. BENnn-Ic'r, PNNsYnvaNm, AssrGNonTo nnmneipm i enana,I or sm. BENEDIe'r,. 11ENNsYLvANIA.

'Pom-TRANSMITTING MEcnANIsM.

Application mea april is, 192s. snat 1ro.' essere.

To all whom t may concern:

` Be it known that L KENNETH DAVIS, a citizen of the United, States, residing at St. Benedict, Ain the county of .Cambria and State of ylPennsylvan-ia, uhave made' certain new and use ul `Improvements in.. Power- Transmitting echanism, `oiwhich the vfollowing is a specification. The ilrventio relates to power-transmitting, speed-red cing and direction-reversing mechanism, andimore particularly to a novel and useful geartmechanism lof the kind described which is, especially adapted for Alise between a rapidly rotating drive anda relatively vvery heavy, and slow-moving load.

Objects and advantages of the invention will be set forth in part hereinafter, and in part will be obvious herefrom, o'r may be ascertained through practice with the invention; the' samey being realized and attained through the instrumentalitiesand combinations pointed, out in the appended claims.

The invention consists in the novel parts constructions, arrangements, combinations andimprovements herein shown and de-A scribed,

The accompanying drawings, herein referr-ed vto and constituting -a part hereof, illustrate one embodiment. of the invention,

and together with the description serveto explain the principles thereof,

Of the drawings;

Fig. 1 is a view, with parts in elevation and parts in vertical transverse section, ,ony the line 1-1 of Fig. 2, of .a mechanism embodying the invention;

AFig. 2 is afvertical section taken on line 2 2 of Fig. 1;. g

Fig. 3 is a diagrammatic representation of a partof the gear mechanism for. the purpose of. explaining the relative movements thereof;

i Fig1-4 is anfragmentary detail showing the pinion drive from the motor shaft'to the housing.'

The herein illustrated and described exempliiication and embodiment of the invention is shown" in my co-pending application i Ser. No. 247,240, 'filed July 29, 1918, applied in a machine lforzloading, transporting and unloading lo'osematerial, and as consti- -tuting a direct-drive, speed-reducing and dif tractiontreads at eachl side vof the machine.

In thev practical application vof the invention'just referred to, the mechanism ofthe present` invention `operates between thel i. rapidly/.rotating 4motor shaft and the relatively slowemoving and heavy-dut treads 'on which the' machine travels, and ywhich the shovel is pushed into the loose materiai` A to get its. load, thel'machi'ne isstarted and'A v -sto ped, driven backwardly and forwardly .05 an wheeled or turned or otherwise' maneuvered as required or desired, vboth whenv unloadediand when under its load. The mechanism possesses great strength, power-transmitting capacity, compactnes's, '10 quick operation, 'and responsivenessv as tok.- starting and stopping, changing direction and the like,`with a very great speed redu'c-y 'L tion ratio, without heating and without undue friction, and with capability for absol,` ,75" dutc, certain, quickly-acting and safe control fromy a distance. i i )It will be understood that this particular 'exemplary practical application of the iii-. l vention lis "illustrativee and not lrestrictive 30 thereof. Other features and advantages of,"A

`the invention will be set forth primarily. in connection withthe lfollowing detailed dc` scription ofthe present embodiment, and it will'be understood that the foregoing gen- 85 eral.l description and also the followin detailed description are explanatory an exemplary and are not restrictive of the inven-` tion; A In the embodiment of the invention yillus- 9u trated by way of example in the accompanying drawings, and in accordance with certa features of the invention,- a. single drive is" provided for two independently contrlled and independently 'operating 95 power-transmitting, speed-reducing, and d1- motion-reversing mechanisms, the mechanism being especially adaptedv for a very high ratio speed reduction in' connection with the independently operating directionaco vthey/.lmay move in opposite directions, or

`one may be in motion in either direction while the other is at move together.

The illustrated .and

rest, or' they may both :nentv is shgwn applied to the two tractionl treadsof a material handling and trans;

porting automotive machine, this particular Aapplication of the invention being fully shown and described in my copending ap plication, 'Serial Number 553,251,1lled April 15, 1922. It will be understood, however.

that the invention is of much more general application than this illustrative application,

thereof.

In said embodied form, and pursuant to the Vfeatures of the. invention already referred to, a shell or housing is provided, receiving the drive from the rapidly rotating` driving shaft and conveying it tothe two speed-reducing and direction-reversing mechanisms and for this purpose carrying a part of the gearing. As embodied. the

shell or housing is provided with an inter-v mediate, concentrically hollow cylindrical i portion 2, journaled in a bearingA 3, with yan interposed sleeve 4, whichy sleeve is provided withy a flange 5,' which takes up the. thrust from the drive of the bevel pinion on the motor shaft.

Except as to minor structural features, the mechanisms from this central l'iearmg to the load on each side, are substantially du` plicate and identical, and a single-description will suffice for both. Itwill be understood,

.. however, that both trains of mechanism are capacitated for independent control, wherev'by through ytheir simultaneous operation either load, such as the'traction treads, can be drlven 1n elther d1rectionor may remain.

at rest, concurrently with any of these opera tions or conditions on or for the opposite side or other load. In the illustrative case of the twotractionftreads, either tread may.

be run forwardly or backwardly Vconcomitantly with the. operation of the oppositetread in the` same direction, thus providingfor the forward or backward travel of the' machine lengthwise of itself-or, one tread may be run forwardly, while the other is run backwardly causing the machine. to wheel sharply either to the right or to the y left, or either tread may .be run forwardly'or backwardly, while the other is at rest, to

wheel the machine less sharply in' either" direction. 1

Continuing the common description, ap-A l licable to either side as stated, the shell or iousing on either side ofthe bearing`2, is, expanded outwardly in al general radial disposed disc or bowl, tdconstitute abearingl for sets of pinions later `tobe described. In Fig. 1, the common drive for. the entire mechanismis'shown on .the right-hand part 6, of the housing, 4as .an annular series of beveled gear teeth 7, with which meshes the driving beveled pinion 8. This pinion in` my copending application is on the motor shaft, but lso far as concerns the general features of the invention, it may represent any. source of driving power. In Fig. 1

this beveled gear ring 7, as a structural fea- 4ture or convenience, 1s shown set into the aouter endsof the shafts 15, 16, ,and 17 Aare supported in the part 19 of the housing and are held in p'lace by clamping screws 20.,

All of the bearings in the gearing mechanismare shownprovi'ded with ball bearings, such bearings -conducing-to keep' the friction and heating within efficiency limits inso condensed and compact a mechanism, which effects such a great speed reduction and `which transmits relatively so great horse-power.

Accordingly, mounted on the respectivel shafts 1 5, 1'6, and 17, are two ball bearings 21 and 22, each set of vthese bearings rotatably carrying a triple gear pinion 23, provided with three annular series of gear teeth, marked as 24, 25 and V26, Iand mesh` ing respectively, with three gear -wheels next to be described.

Meshing with the series of gear teeth 24 on each of the pinions 23, is a gear wheel 32, fixed on a shaft 33. -The inner end of shaft 33 is journaled in a ball bearing 34, withinv the cylindrical part 2 of the housing, and is i provided with a retaining nut 35 for the ball race, screw-threaded on the Vinner end of the shaft within the part 2 of the shell. The shaft 33 extends laterally outwardly, concentricwith the housing, andv is journaled in a ball-bearing 36. This ball-bearing is mounted in a 4fixed'bearing 37, carried on a standard -38, extending upwardly from .the bed A39 ofthe machine. y

An annular retaining flange 40 is fixed on the sprocket hub to maintain the, ball races in position. The load is driven from the shaft 33, and in the exemplary embodiment, a sprocket wheel 41 is fixed to shaft 33 by keys 42, a nut 43 being screw-threaded on the end of the shaft to hold the sprocket wheel in position thereon.

The annular series of gear'teeth 25ct' each of the' triple pinions 23, meshes with a gear wheel mounte .upo and concentric with the shaftl 33 and hav/'ng a ball bea-ring 48 upon the shaft. l l" C Thissleeve 49,'inte'gral with and extending outwardlyfrom the gear wheel '47, is mounted upon the shaft 33, a bushing 50,

jg, fixed to a sleeve 49 loosely l being preferably interposed therebetween,

Means arev providedv 'whereby `the gear I wheel 47 is permitted to rotate freely or is,

held against rotation,`as desired, -to effect 'a desired function or change in the directi'iml 'of the drive. As embodied, Vai brakel drum 56 is carried upon a plateor disc 57, which is fixed to the sleeve 49 by one lor more keys' 59 and has a ball bearing 58 upon the shaft 33. l l l y I l The other annular "series of gear'teeth 26 vof thetrifple pinion 23 mesh witha gear wheel 66, which is integral with, orlfast to, a

-sleeve 67 which is concentric with the shaft 33, and surrounds .the sleeve.49;"an d which has' a pair of ball bearings 68 and 69 upon the sleeve 49'. A spacing collar 70 is provided between the ball bearings.'

' yIn like manner, means are provided whereby the4 gear wheel 67 4 is permitted to rotate or is held against rotat1on,.to'e'ect the'desired change or functionin the drivving of the load. As embodied, a brake drum 71is fixed to, or is .integral with, adisc lor plate 72 fixed vto the sleeve` 67 by suitable meansv such as keys 73.' l

. The riml ofhe inwardly extending end portion 19 ofthe housing6 rests upon a ball bearing' sleeve 67; A spacin andthru'st-absorbing hanged sleeve t7 5 enclrcles the shaft 33 between the ball bearings 36 land'.l y I In the exemplary applicati' noff th to the traction treads ofthe material vhan- L dling and` transporting machine, 'both of the traction tread engaging sprocket"wheelsv 41.

mesh in theopenings betweenarollersl 82,

whichvroll'ers4 are loosely mounted'onrods or shafts 83', which also carry the floor or goundenga ing links 84, 85, 86 an d 87 of t e tread.` pacing links or blocks 88, 'are also. mounted on the shafts or rods83, with -washers 89 and binding links 90..A Thelinks u 'the' sup if or lugs84 andI 87, extend inwardly, .spaced apart by thelrollers 82, andseat -wthinfthe groovelike :part 91 of 1 rting and guiding 'wheels-for' the annular depressed or tread, t e. wheels having parts 92 of greater 4 I outer parts of thetread. 1

diameter at either side,- having cylindrical peripheral bearngs 93 for the inner and The supporting and 'guiding iivheelsl are rotatably 'mounted on stub`shafts 96. which are set'into bearings in hubs 97on the ma-v chine frame, and are held in place on the shafts -by keys '98 and clamping screws 99.

AOn the outer 'pins 101 keep ends washers; 100 and cotter the wheels from outward displacement on their shafts. v In the embodiedform' of means for holding and releasing the .gear wheels 47 and 67,

71 'and 5 6, respectively, are prothe drums vided with brake bands 106, which may bel- Of any Standard 0r' suitable fornn fMidv aref' `shown in Fig. 2 with actuating levers 107,

diagram,

74, which in turn rests' upon the drive vwheel 32 stationary,

-cause rotation of pinion 25' pivoted at 108, one end of the brake band being pivoted to the leverv at 109, and the other end of the brake band being anchored I on the' pivot bearing 108.

In Flg. 2 the actuating means shown for the brake band is a solenoid 110, mounted on a support "112, and having its' core 111 pivotally connected at 113 to the brake band actuating lever ing mechanism permits of the distant control and operation of thel machine as dis- 107. This'form of actuatclosed-in my copending application Serial Number 445,701,

so far'as the present invention is concerned,

other 'forms of' control couldbe employed.

The manner-of operation of the mechanism just described is substantially as follows l lIn Fig. 3 the pinions carried by the hous .ing are shown diagrammatically, one in Kand the other arrow a, if both brake drums 19 and 56v are free, the load will hold shaft 33 and gear .filed Feb.' 17, 1921, although I the same as in the other figures of and the gears 47 and I67 and ltheir brake'drums-19 and 56, respectively will *have` a certain amount of idlev rotation.

If brake drum 56 be heldhthis will hold gear wheel 47 against rotation, and this will about its shaft 15, or 16 and 17 as the case may be, by.

reason of the pinion meshing with and roll- .ing on the teeth of thestat-ionary gear wheel.

Pinion 24 will rotatewith the pinion 25,v but as its angular advancekabout shaft 33 lio isgreater than its own angular velocity',

due to its rotating with pinion 25-while havcorresponding and compensating plus rotation to the-gearwheel 32 andto the shaft 33,'and will correspondingly drive the load, which in this case is the' traction tread.

ing a lesser circumference, itwill impart a If the brake drum 71 be held, gear wheel 67 is held therewith, and pinion 26 will ro- Y tate about its axis on the shaft 15, or 16 or .17, as

it rolls about in mesh with the stationary gear wheel 67. Again the gear wheel 24 will rotate with pinion 26, but as its angular velocity about its own* axis is greater than its angular movement about the shaft 33, due to its having a greater circumference than pinion 26, it will impart a correspond- 1 ing ge r wheel 32, and though the shaft 33to the load. Thatis, it willbedn theopposite :and compensating minus rotation to the -direction from the movement when the ing with each of said gear wheels, a rotatlbrake drum 56 is held. The fact that the drive on shaft 33 is in one direction with respect to pinion and is in the opposite direction with respect to the pinion 26 is due to the fact that the pinion 24 is intermediate in size between the two.

From all' the foregoing it will be .unders' stood that a machine and mechanism have been provided realizing the objects and advantages hereinbefore set. forth, together with other objects and advantages; and'that changes may be. made from the exact structure shown and described, within the scope of the accompanying claims, Without departing vfrom the principles of the inventionv and vwithout sacrificing its chi-ef advantages.

What I claim is 1. A speed reducing and reversing driving mechanism including in combination a driven shaft having a gear wheel fixed thereto, a sleeve and a gear wheel fixed thereto; the gear wheel being of less diameter than the gear wheel on the shaft, a second sleeve and a gear wheel fixed thereto, the gearl Wheel being of greater diameter than the gear wheel on the shaft, one of the sleeves being rotatablyv mounted on the shaft and the other sleeve being rotatably mounted on said sleeve, a pinion having gear teeth meshable shell in which said pinion is journaled provided with gear teeth near its periphery,

geared meansl engageable with the gear teeth on the shell for driving it, and means for selectively holding the larger or the smaller gear wheel against rotation.

2. A speed reducing and 'reversing driving mechanism including in combination two gear trains each comprising a driven shaft having a gear wheel fixed thereto, asleeve and a. gear wheel fixed thereto, ythe gear wheel being of less diameter than the gear Wheel on the shaft, a'second' sleeve and a gear wheel fixed thereto,fthe gear wheel being of greater diameter than the gear wheel on the shaft, one of the sleeves being rotatably mounted A'on the shaft and the other sleeve being rotatably mounted on` said Sleeve'-, a pinion having gearA teeth meshing with each of said gear wheels, means for rotating the pinion axis concentrically with said shaft, means in each [gear train operating independently of the 'like mea-ns'in the other'gear train for selectively holding the larger or'the smaller gearvw-heel against rotation and means connected to a source of power and to both gear trains for applying Ipower thereto.

3.' A speed reducing and reversing driving mechanism including in combination two gear trains each comprising a` driven shaft, the shafts of the two gear trains being concentric, having a gear Wheel fixed thereto, a sleeve and a gear Wheel fixed thereto, the gear Wheel heir-1g'A of less diameter than the gear wheel on the shaft, y

a second sleeve and a gear wheel fixed thereto, the gear wheel'being of greater diin each gear train operating independently of the like means in the other gear trainfor selectively holding the larger or the smaller gear wheel against rotation and means connected to a source of power and to both gear trains for applying power thereto.

4. A speed reducing and' reversing driving mechanism including' in combination a pinion carrying shell having' a cylindrical part, a journal hearing therefor, a shaft concentric withthe cylindrical part of the shell and journaled in said cylindrical part, a. `journal for the shaft, a gear wheel fixed on the shaft, a pinion having a plurality of sets of gear teeth and having one set of gear teeth meshing with said gear wheel fixed on the shaft, a gear wheel concentric'with the shaft but rotating relatively thereto and.

-centric with the cylindrical part of the shell -and' journaled in `said cylindrical part, a

journal for the shaft. a gear wheel fixed on the shaft, a'pinion having ar plurality of sets of gear .teeth and having one set of gear teeth' meshing with said gear wheel jfixed'on the shaft,a pluralityof gear wheels concentric with the shaft, 'one of said gear Wheels being ofgreater diameter `than the gear'ivheel on the lshaft and another of said gear wheels -being of lessdiameter than the gear wheel on the shaft, and means for selectively and independently holding said concentric gear Wheels against rotation to cause the shell to rotate` the shaft in a desired direction, an` annular series of gear teeth on the shell and a driving pinion meshing therewith.

6. A Speed reducing and reversing driving mechanism including in combination a pinion carrying shell, a shaft, a gear wheel fixed on the shaft, a pinion having a plurality of sets of gear teeth and having one set of gear teeth meshing with said gear driving pinion meshing therewith.

7. A speed reducing and reversing driving mechanism including in combinationa4 pinion `carrying shell, a shaft, a gear wheel fixed on the shaft, a pinion having a plurality of sets of gear teeth and having one set of gear teeth meshing' with said gear wheel xed onthe shaft, a lurality of gear Wheels concentric with the ys iaft, one of said gear wheels beingof greater diameter than the gear wheelson the shaft and another of 4said gear wheels being of less diameter than the gear wheel on the shaft, means for selectively and independently holding said concentric gear wheels against rotation to cause the shell to rotate the shaft forwardly or backwardly, an annular lseries-.of gearF teeth on the shell anda driving pinion meshing therewith.

8.l A speed reducing and reversing driving mechanism including in combination a pinion carrying shell having a cylindrical part, a shaft concentric with the cylindrical part -of the shell and journaled in said cylindrical part, a gear wheel lixed on the shaftfa pinion having a plurality of sets of A gear teeth and having one set of gear teeth meshing with said gear wheel fixed on the shaft, a gear wheelk concentric with the shaft but -rotating relatively thereto and meshing With another set of gear teeth `on the pinion,'means for holding the last mentioned gear wheel Afrom rotation to cause the shell to drive the shaft, and an'annular seies of gear teeth near, the periphery of the shell y i i'ng mechanism including in coii'ibinationay and a'driving' pinion meshing therewith.

9.`A speed reducing and reversing driving mechanismv including in combination a `pinion carrying shell having a cylindrical part, ashaft concentric-'with the cylindricaly partlof the' shell and ,journaled' in said cylindrical part, a gear wheel fixed on the shaft, a in ion having a plurality of sets of gear teet and having one set of gear teeth meshing with said ear Wheel fixed on the shaft, a plurality lo ear wheels4 concentric with theshaft, one o said gear wheels be- V ing of greater diameter than the gear wheel on the shaft and'another of said gear Wheels being of less diameter than the 'gear wheel on ,t e shaft, and means for selectively and independently holding vsaid concentric' ear wheels against rotation to cause the she to rotatethe shaft forwardly or backwardly, an annular series of gear teeth on the shell and a driving pinion meshing therewith.

' 10. A speed reducing and reversing driving mechanism including in combination a pinion carrying shell having a cylindrical part, a journal .caring therefor, a shaft conwith another yset of centric with the cylindrical part of the shell and journaled Iin said cylindrical part, a

journal for the shaft,x a gear wheel fixed on the shaft, a pinion havinga plurality of sets of gear teeth and having one set of gear teeth meshing with said gear wheel fixed on .the shaft, 'a gearwheel concentric'with the shaft but rotating relatively thereto and meshing with another set of gear teeth on the pinion, and means for holding the last mentioned gear Wheel from rotation to'cause the shell to drive the shaft, an annular-series of gear teeth on the shell and a driving pinion meshing therewith, and a bearing for the shell concentric with and supported by the shaft. i

i 11. A speed reducing and reversing gearing mechanism including in combination a pinion carrying shell having a cylindrical part, a journal bearing therefor, a shaft, concentric with the cylindrical part of the s helland journaled in said cylindrical art,

a journal for the shaft, a gear wheel Xed on the shaft, a pinion having a plurality of sets of gear teeth and having one set of gear teeth meshing with said gear. wheel l{ixed on the shaft, a plurality of ear wheels concentric with the shaft, one o? said gear wheels being `of greaterl diameter than the gear wheel on the shaft and another ofsaid gear 'wheels being of less diameter than the gear wheel on the shaft, and means for vse ectively and lindependently holding said concentric gear wheels against rotation to cause the shell to rotate the shaft in a desired direction, an annular series of ,gear

teeth on the s'hell anda driving pinion mesh-` v ing therewith and a bearing forv the shell` concentric with and supported by the shaft.

l2. A speed reducing and reversing/drivteet meshing with said gear wheel fixe .on

the shaft, a gear lwheel concentric with-the 'Shaft but ,rotating relatively thereto' and meshing with another set of gear teeth 4on the pinion, and means for holding the last I mentioned gear wheelfrom rotation to cause the shell to drive theI shaft, an annular series of (gear teeth near the periphery of the shell, a

riving pinion meshing' therewith, and a bearing for the shell concentric with and sgpported. by the shaft.

13. A speed reducing and reversing driving mechanism including in combination a pinion carrying shell having a cylindrical part, a shaft rd'rcentric with-the cylindrical part ofthe shell and journaled in said cglindrical part, a gear wheel fixed on t e shaft, a pinion having' a plurality of sets ofl gear teeth and having one set `of gear teeth meshing with said gear wheel fixed on the shaft, a plurality ofgear Wheels concentric with the shaft, one oi said gear wheels being of greater diameter than the gear wheel on the shaft and lanother of said gear wheels being of less diameter than 4the gear wheel on the shaft, and means for selectively and independently-holding said concentric gear wheels against rotation to cause the shell to rotate the shaft forwardly or backwardly, anl annular series of gear teeth on the shell, a driving pinion meshing therewith and a bearing for the shell concentric with and supportedby the shaft. 4

14. A speed reducing and reversing driving mechanism including in combination a double shell having a mediate cylindrical part constituting a bearing, speed reduction gearing connected to each part of the shell, means ifor independently*controlling said speed reduction gearings, and means for driving the. shell. l

l5. vA speed reducing and reversing driving mechanism including in combination a double shell having a mediate cylindrical partl constituting a. bearing, direction reversing gearing connected to each part of the shell, means for independently controlling said direction reversing gearings, and means for driving the shell.

16. A speed reducing and reversing driving mechanism including in combination a double shell having la mediate cylindrical part constituting a bearing, speed reduction and 'direction reversing gearing connected toy each part. of the shell, means for independently controlling said speed reduction and direction reversing gearings, and means for driving the shell.

17. AI speed reducing and reversing driving mechanism including in combination a double shell having a mediate cylindrical .jpartfconstituting a bearing, speed reduction ineansyfor independently controlling Isaid speed reduction gearings, anannular series off gear teeth on' the shell, and a driving pinionfmeshing therewith.`

Aspeed reducing'and reversing driv# H. ,fechyanism including in combination af oiible lshell havin r1 a mediate cylindrical )art constitu( ing a lieari'ng, direction reversing gearing connected to each part ot "the ishell, means tor 'independently 'controlling :said direction reversing gearings, an annular series of gear teeth on the shell.` and a driving pinion meshing therewith. f

19. A speed reducingl and reversing driving mechanism including in` combination a double shell having a mediate cylindrical part. constituting a bearing, speed vreduction and direction reversing gearing connected yto each part of the shell, means for independently controllingy said speed 'reduction double gearinggconnected to/each part ot theshcll, nach olsaid shafts.

i and direction reversing gearings, an annular series of gear teeth on the shell, and a driving pinion meshing therewith.

20. A speed reducing and reversing driv-' ing mechanism including in combination a double Vshell having a mediate cylindrical part constituting a bearing, two separate sha-tts, each having an end journaled in said cylindrical part of the shell and gearing connecting the shell and each of said shafts.

21. A speed reducingland reversing driving mechanism including in combination a double shell having a mediate cylindrical. part constituting a bearing, two separate shafts, each having an end journaled in said cylindrical part of the shell and gearing connecting the shell and cach ot said shafts and separate controls for said two sets oi" gearing.

A speed reducing and reversing driving inechanisn'i including in combination al double shellhaving a mediate cylindrical part constituting a hearing,` two separate shafts, each having an end iournaled in said cylindrical part o'l" the shell and speed reducing and direction changing gearing ccn-v necting the shell and each of said shafts.

23. A speed reducing and reversing driving` mechanism including in combination a double shell having a mediate cylindrical part constituting a bearing, two separate sha-tts. each having an end journaled in said cylindrical part oi" the. shell and speed reducing and direction changing gearing connccting. the shell and each ot said shafts and 100 separat.;x controls tor said two sets ot gearing.

2li. A speed reducing and reversing driving mechanism including in combination a shell having a mediate cylindrical 105 part constituting a bearing, two separate shafts. each having an end journaled in said cylindrical part et the shell and 'direction changing gearinfsr connecting theshell and dou-ble `shell having a lmediate cylindrical pai-'t constituting aibearing. two separate hshaits, each having an end-journaled in said -cylindri'cal part ol' the-shell and direction changing gearing connecting the-shell and cach et VA said shafts and separate controls For sai ly two -sets of gearing. e

Q. vA speed reducing and reversing driving mechanism including in comhinatim a double shell having a mediate cylindrical part constituting a bearing, two separate shafts, each having an end liournaled inl said cylindrical part ot the shell and gearing connecting the shell and each of said shafts, an

lannular series of gear teeth on said shell,

and a pinion meshing therewith.

27. A speedv reducing and reversing driving mechanism including in;combinatrzml a gearing, an annular .rasant double lshell having vaf mediate cylindrical part constituting'a bearing, two lseparate shafts, each having an endjournaled in said cylindrical art pf the shell and gearing' connecting tv e shell and ea'ch of said' shafts and separatel controls 'for said two lsets of seriesof gearv teeth cu 29. A speed reducing and reversing driving mechanism including in combination a double. shell having a mediate-cylindrical part constituting a bearing, two 4separate shafts, each having an end journaled in said i cylindrical p-art of thel shell and ldirection changing gearing vconnecting thesh'elland each of said shafts, an vannular series of gear' teeth on said shell, and apinion meshing therewith.

30. A speed reducing and reversing driving mechanism including in combination a double shell having a mediate cylindrical part'constituting a bearing, two separate shafts, each -having an endjournaled in said cylindrical part of the shell and direction changing gearing connectingthe shell and each of said-shafts andseparate controls for said two sets of gearing, an annular series of gear teeth on said sl1ell,jandv a pinion meshing therewith. j

31; .A speed reducing and reversing drivinL mechanismivncludlng in combination a double shell having a mediate cylindrical part constitutinga bearing, two separate shafts, each having, an end journaledin said cylindrical part of the` shell and direction 1 changing gearing connecting the shell' and each of said shafts and separate/controls for said two sets of gearing andconnections to a load at the o-Tmosite ends of each of said shafts, an annular series of gear teeth on said shell, and a inion meshing therewith.

32. A speed re ucing and reversing drivshafts, each having an end journaled in ing mechanism including in combination a d'ouble ,shellfhaving a mediate cylindricall part constitutinga bearing, two separate said cylindrical part of the shell vand gearing connecting. the shell and each of said shafts and connections to a load at the 'opposite ends of each of saidshafts.

y33. A speed reducing and reversing driving mechanism including in combination a double shellhaving a Smediate cylindrical.

part constituting a bearing, two separate gearing and connections to a load at the T shafts, each having an end journaled in said cylindrical part of the shell and gearlng connecting the shell and each vof said shafts and separate controls -for said twolsets of opposite ends of each of said shafts.

34. A speed reducing and reversing driving mechanism including in combination `a double shell having a mediate cylindrical part constituting a bearing, two separater shafts, each having'an end journaled in said Acylindrical part of the shell and speed re.-

`part constituting a bearlng, two separate 105 ducing'and direction changing gearing connecting the shell and each of said shafts and connections' to a load at the opposite ends of each of said shafts. p 1

' 35. A speed xreducing andreversing drivf ing mechanism including in combination a double shell having a mediate cylindricaly part constituting a bearing, two separate S5 shafts, each having an end journaled in said cylindrical partlof, the shell and ydirection changing .gearing connecting the shell and each of said shafts and connections to a load at the opposite ends of .each of said shafts.

3.6.-,A speed reducing and. reversing driving mechanism including in combination a double shell having a mediate cylindrical part constituting a bearing, two separate shafts, each having an end journaled in said cylindrical part of the shell and directionl changing gearing connecting the shell and each of said `shaftsand separate controls for said two setsof gearing and connections to a load' at the' opposite ends of each of said 100' shafts. y A

l37. A speedl reducing and reversing drivin mechanism `including in combination a double shell having a mediate cylindrical shafts, each having an end journaled in said. cylindrical part of thel shell and gearing connecting the shell and each of saidv shafts,

4an annular series of gear teeth on said shell,

a pinion meshing therewith and connections 1 0 load at the opposite'ends of each of said y to a shafts. o B8. lA speed reducing and reversing driving mechanism includingi in combination a double shell Nhaving a mediate cylindrical ufr part constituting a bearing, two separate shafts, each having an end journaled in^said cylindrical part of the shell and gearing connecting the shell and each of said shafts and separate controls for Asaid two sets o gearing, an annular series of gear teeth on said shell, a pinion meshing therewith, and connectionsto a load 'at the opposite ends of each of said shafts. i i

39. A speed reducing and reversing driving mechanis including in combination a: doubleshell aving a mediate cylindrical f part constituting a bearing, twov separate shafts, each having an end journaled in vsaid 13o cylindrical part'of` the shell; and speed` re- -ducing and direction changing gearing con# neoting the shell and each of said shafts and separate `controls for said two sets of gearing, an annular series of gear teethon said shell, a pinion meshing therewith and contriple pinion having three annular series of gear teeth of different diameters, a rotatable shell in which the triple pinion is mounted and provided with gear teeth near its periphery constituting a relatively high speed reduction drive,4 three gear wheels meshing'with the respective series of gear teeth on thel pinion. the gear Wheel meshing with the series of gear teeth of intermediate diameter being fixed to a shaft for drivinga load, 'and means for selectively holding either of the other two gear Wheels against rotation. v

41. A speed reducing and reversing driving mechanism including in combination a triple pinion having three annular series of gear teeth of different diameters, three gear Wheels meshing with the respective series of gear teeth on the pinion, the gear Wheel meshing with the series of gear teeth ot in'- termediate diameter being fixed to a shaft for driving a load, means for selectively holding either of the other two gear Wheels against rotation, and a shell in which ther 

